Remove/install engine management control unit (MCM)

AR07.08-W-7013H

Remove/install engine management control unit (MCM)

22.10.2018

Engine

470.9 in model 963, 964

except code M8A (Air intake, from front)

Engine

471.9 in model 963, 964

except code M8A (Air intake, from front)

Modification notes

09.10.2018

Check for proper operation of engine management, added.

Operation step 21

09.10.2018

Notes regarding safety-relevant components, added.

AH00.00-Z-0019-01A

1

Electrical connector

4

Bolts

7

Bracket

2

Electrical connector

5

Decoupling elements

8

Electrical wiring harness

3

Oil suction pipe

6

Screw

A4

Engine management control unit (MCM)

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Notes on safety-relevant components

AH00.00-Z-0019-01A



Remove

1

Connect diagnostic system, start XENTRY and perform quick test.

Only if the engine management (MCM) control unit (A4) is replaced.

2.1

Select Control unit replacement and follow the instructions.

Only if the engine management (MCM) control unit (A4) is replaced.

 Control unit replacement is completely menu-assisted under:
MCM - engine management (A4)  
Adaptation  
Initial startup 
Control unit replacement

2.2

Switch off ignition.

If engine management (MCM) control unit (A4) is not replaced.

3

Remove noise encapsulation.

4

Expose electrical wiring harness (8) along the crankcase.

Only for vehicles with code A1A (Front axle air-sprung).

5

Remove oil suction pipe (3).

Only for vehicles with code A1A (Front axle air-sprung).

6

Disconnect the electrical connector (1) from the engine management (MCM) control unit (A4).

7

Remove screws (6) and disconnect electrical connector (2) from engine management (MCM) control unit (A4).

8

Remove bracket (7) from the engine management (MCM) control unit (A4).

9

Unscrew screw/bolts (4).

10

Remove engine management (MCM) control unit (A4) with the decoupling elements (5) and take out.



Install

11

Install engine management (MCM) control unit (A4) with the decoupling elements (5).

 Observe installation position of the decoupling elements (5).

12

Tighten bolts (4)

 Engine 470.9, engine 471.9Bolt, engine management (MCM) control unit to crankcase

*BA07.16-N-1017-03A

13

Attach bracket (7) to the engine management (MCM) control unit (A4).

 Engine 470.9, engine 471.9Bolt, bracket for oil suction pipe to engine management (MCM) control unit

*BA07.16-N-1035-03A

14

Connect electrical connector (2) to engine management (MCM) control unit (A4) and tighten screws (6).

 Engine 470.9, engine 471.9Bolt, electrical connection to engine management (MCM) control unit

*BA07.16-N-1030-03A

15

Connect the electrical connection (1) to the engine management (MCM) control unit (A4).

16

Install oil suction pipe (3).

Only for vehicles with code A1A (Front axle air-sprung).

17

Fasten electrical wiring harness (8) along the crankcase.

Only for vehicles with code A1A (Front axle air-sprung).

18

Install noise encapsulation.

19

Follow instructions for "Control unit replacement".

Only if engine management (MCM) control unit (A4) was replaced.



Check

20

Perform engine test run.

Only if engine management (MCM) control unit (A4) was replaced.

21

Check the engine management for proper operation.

Only if engine management (MCM) control unit (A4) was replaced.

AR07.08-W-1000-01A

22

End XENTRY and remove the diagnostic system.

Only if engine management (MCM) control unit (A4) was replaced.

 Common rail diesel injection system

Number

Designation

Engine 470.9

Engine 471.9## ## up to 032690

BA07.16-N-1017-03A

Bolt, engine management (MCM) control unit to crankcase

Nm

15

15

 Common rail diesel injection system

Number

Designation

Engine 471.9## ## as of 032691

BA07.16-N-1017-03A

Bolt, engine management (MCM) control unit to crankcase

Nm

15

 Common rail diesel injection system

Number

Designation

Engine 470.9

Engine 471.9## ## up to 032690

BA07.16-N-1030-03A

Bolt, electrical connection to engine management (MCM) control unit

Nm

25

25

 Common rail diesel injection system

Number

Designation

Engine 471.9## ## as of 032691

BA07.16-N-1030-03A

Bolt, electrical connection to engine management (MCM) control unit

Nm

25

 Common rail diesel injection system

Number

Designation

Engine 470.9

Engine 471.9## ## up to 032690

BA07.16-N-1035-03A

Bolt, bracket for oil suction pipe to engine management (MCM) control unit

Nm

25

25

 Common rail diesel injection system

Number

Designation

Engine 471.9## ## as of 032691

BA07.16-N-1035-03A

Bolt, bracket for oil suction pipe to engine management (MCM) control unit

Nm

25